两个时态

joywzy

我一直晕时态。请大家帮助。

T16， Soaring television costs accounted for more than half the spending in the presidential campaign of 1982, a greater proportion than it was in any previous election.
B. a greater proportion than
C.a greater proportion than they have been
d. which is greater than was so
e. which is greater than it has been

Ans:C
我选了B，我想如果要补全的话，应该用a greater proportion than they had been，因为前面有个过去的时间。为何不对呢？

T32, To develop more accurate population forecasts , demographers have to know a great deal more than now about the social and economic determinants of fertility.
B.have to know a great deal more than they do now about the social and economical
c. would have to know a great deal more than they do now about the social and economical
d. would have to know a great deal more than they do now about the social and economic
e. would have to know a great deal more than now about the social and economic

Ans

我在A、D之间选择，不知如何判断时态？我想干脆省略了，是不是就没有这个问题了？

谢谢。

joywzy

up.

joywzy

up.

joywzy

请大家帮助。谢谢。

zhouhaichen

up

[此贴子已经被作者于2003-11-11 9:12:19编辑过]

joywzy

zhouhaichen,

T32,我想是不是有虚拟的意思在呢?所以用would have ,我发现从句意来理解,比起从语法上讲,往往更能做对题.

T16,请大家帮助.

mjiehu

more than now???

dandan74

joy mm, 我也最晕时态，记得braveMBA在前面的一个帖子中说了，要降低时态的优先级，很有道理，到不得已的时候再用。
T32 这里通过区分economical和economic就可以排除三个选项，more than now又排除一个，都可以不用时态. 当然用would的虚拟语气好些。
T16题，比较的是costs, 只有一个选项有they，其它的不明确或it不对，对于have been可以理解为到现在为止。

joywzy

以下是引用dandan74在2003-11-11 15:30:00的发言：
joy mm, 我也最晕时态，记得braveMBA在前面的一个帖子中说了，要降低时态的优先级，很有道理，到不得已的时候再用。
T32 这里通过区分economical和economic就可以排除三个选项，more than now又排除一个，都可以不用时态. 当然用would的虚拟语气好些。
T16题，比较的是costs, 只有一个选项有they，其它的不明确或it不对，对于have been可以理解为到现在为止。

dandan,谢谢.

T16,如果我用B,会不会更好.这就避免了时态的麻烦.因为如果用C,应该用过去完成时,会不会更好?

其它的已明白了.谢谢.

joice

mm, B is wrong because of " it" . costs is plural.

[此贴子已经被作者于2003-11-12 9:03:53编辑过]